Page 578 - IRSEM_Main Book

S No Term Description/Meaning in SEM Relevant paras
27 Block Overlap Block overlap, is the adequate distance in advance of the first stop signal of a block station, 7.1.8,7.1.14(a),
which shall be kept clear and unoccupied by any vehicle, before line clear is granted to the 7.5.2(a),18.12.1(b,c,j)
station in rear.
7.1.14(a,g), 7.5.1,
That portion of the running line between two block stations on to which no running train may
28 Block Section enter until Line Clear has been received from the block station at the other end of the block 8.1.1(a), 12.5.14(e),
17.3.7, 17.6.2(d),
section.
17.7.4, 18.12.1
Braking It is the distance travelled by a train after application of brakes by it`s loco pilot. 7.1.13 (b),7.1.15 (e)
29
Distance 13.3.5(c), 20.1.2 (c)
Catch Siding is a siding, provided to protect the Station Section, if the gradient is steeper than 7.4.9(b), 7.5.1, 7.5.2,
Catch Siding, 1 in 80 falling towards the station section. 7.5.3, 7.5.5, 7.5.6,
30
Slip Siding Slip Siding is a siding, provided to protect the Block Section, if the gradient is steeper than 1 7.5.7, 9.2.1(d),
in 100 falling towards the Block Section 21.1.12(a)
Centralised 5.2.2(A), 5.3.2(C),
It is a system by which the working of trains over a route, to which the system applies, is
31 Traffic Control governed by fixed signals remotely controlled from a designated place. 13.4.1 (e), 13.4.2 (g),
(CTC) 13.4.10(a),
Where Line clear may be granted for a train, before the line has been cleared for the
32 Class B Station
reception of the train within the station section.
Clear Standing Distance between foot of the signal to Fouling Mark in the rear on the same line in case of Annexure: 8-A2
Length (CSL) Main line and Directional loop at Station yard. In case of Common Loop at the stations, Clear
33
Clear Standing Available Length/ Clear Standing Length shall be the distance between two starter signals of
Room(CSR) opposite direction on the same line.
Colour Light A fixed signal in which the indications are given by the colour of a light only. 16.2.2(a),16.4.1 (e),
34
Signal (CLS) 19.2.1, 20.5.1
Commissioner 3.6.5(b), 8.1.1(j),
An official, appointed to exercise any functions under the Act. (Explanatory notes: CRS
35 of Railway sanctions will be required for carrying out certain types of works. Details given in Chapter 9) 8.1.3(b), 9.2.3,
Safety (CRS) Annexure: 9-A1
Competent
36 Railway A railway servant duly qualified to undertake and perform the duties entrusted to him
Servant

Annexure: G4: Glossary of Technical Terms for Signal Engineering Manual Page 517 of 535